<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .father {
            overflow: hidden;
            width: 300px;
            height: 300px;
            margin: 100px auto;
            background-color: pink;
            text-align: center;
        }

        .son {
            width: 200px;
            height: 200px;
            margin: 50px;
            background-color: purple;
            line-height: 200px;
            color: #fff;
        }
    </style>
</head>

<body>
<div class="father">
    <div class="son">son儿子</div>
</div>
<script>
    // 常见事件对象的属性和方法
    // 阻止冒泡  dom 推荐的标准 stopPropagation()
    var son = document.querySelector('.son');
    son.addEventListener('click', function (e) {
        alert('son');
        e.stopPropagation(); // stop 停止  Propagation 传播
        e.cancelBubble = true; // 非标准 cancel 取消 bubble 泡泡
    }, false);

    var father = document.querySelector('.father');
    father.addEventListener('click', function () {
        alert('father');
    }, false);
    document.addEventListener('click', function () {
        alert('document');
    })
</script>
</body>

</html>
